How to increase the time length of the animation without slowing it down?
If you go to the Graph Editor panel, select each "string"/line (these lines represent the way Blender handles the animation data), go to the modifiers tab (This is not the one in the Properties panel, press T if the right-side panel is not visible. You should see a Modifiers tab there.), add a Cycles modifier, and you should the have a repeating animation. Some tweaking may be necessary for it to work correctly. You should need to have the animation repeat five times.